There is initial support for a few Virtual Reality devices in postmarketOS, including Oculus Go, Lynx R1, META Quest 3S (panther) and the upcoming Steam Frame. I also own a OnePlus 6 which runs Godot Native Mobile VR with a Cardboard-compatible smartphone holder. Combining this with a Vive Tracker and libsurvive gives you six degrees of freedom in Godot Beep Saber VR.